Employee Benefit Plans (Long-Term Incentive Plan) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($) performance_cycle	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Long-Term Incentive Plan
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Performance period	3 years
Number of separate three-year performance cycles | performance_cycle	3
Consecutive trading days	30 days
Estimated payout for the plan, current	$ 17.4
Plan related expense	$ 24.9	$ 42.3	$ 40.8
Long-Term Incentive Plan | Minimum
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Payouts as percentage of the participant's salary	0.00%
Long-Term Incentive Plan | Maximum
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Payouts as percentage of the participant's salary	200.00%
2016 Long-Term Incentive Plan
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Percentage of non-GAAP net income as component of performance measures of the plans	37.50%
Percentage of total non-GAAP revenue as component of performance measures of the plans	37.50%
Percentage of relative shareholder return as component of performance measures of the plans	25.00%
2016 Long-Term Incentive Plan | Maximum
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Potential payout, assuming maximum objectives are achieved	$ 25.2
2017 Long-Term Incentive Plan
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Percentage of non-GAAP net income as component of performance measures of the plans	37.50%
Percentage of total non-GAAP revenue as component of performance measures of the plans	37.50%
Percentage of relative shareholder return as component of performance measures of the plans	25.00%
2017 Long-Term Incentive Plan | Maximum
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Potential payout, assuming maximum objectives are achieved	$ 16.4
2018 Long-Term Incentive Plan
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Percentage of non-GAAP net income as component of performance measures of the plans	37.50%
Percentage of total non-GAAP revenue as component of performance measures of the plans	37.50%
Percentage of relative shareholder return as component of performance measures of the plans	25.00%
2018 Long-Term Incentive Plan | Maximum
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Potential payout, assuming maximum objectives are achieved	$ 16.3